订阅基本用户控件中定义的事件 - ASP.NET

Question

我有一个基本用户控件（继承自 System.Web.UI.UserControl）

public delegate void MyEventHandler(object sender, MyEventArgs e);
public event MyEventHandler ControlLoaded;

//Fire the event from here
protected override void OnLoad(EventArgs e)
{
  MyEventArgs cmdEventArgs = new MyEventArgs("somearg");
  ControlLoaded(this, cmdEventArgs);
}

我有几个从这个基本用户控件派生的控件。

在宿主 ASPX 页面上，我需要订阅 ControlLoaded 事件。

protected void Page_Load(object sender, EventArgs e)
{
  //subscribe to the event
  //This line DOES NOT WORK as I cannot attach event to a base control - It needs an instance of the user control which I don't have
  BaseUserControl.ControlLoaded += new MyEventHandler(ControlLoaded);
}

private void ControlLoaded(object sender, MyEventArgs e)
{
 // some control has been loaded
}

如何订阅ControlLoaded 事件？谢谢

Answer 1

如果没有要订阅的实例，您就无法真正订阅实例事件。您可以使用 BaseUserControl 上的静态事件来执行此操作。然而，这不是一个好主意。因为您需要绝对确保在请求完成之前取消订阅该事件，以防止内存泄漏。